Electric web-drying machine.



J. G. SHERMAN.

ELECTRIC WEB DRYING MACHINE.

APPLICATION lILED APR. 29, 1911. RENEWED JAN.8. 1914.

1,106,683. Patenteai Aug. 11, 1914.

tantra!) STATES PATENT OFFICE.

JQHN C. SHERMAN, OF BROOKLINE, MASSACIIUSETT$, ASSIGNOR TO HOWARDPAR-KER, OF BERLIN, NEW HAMPSHIRE.

ELECTRIC WEB-DRYING MACHINE.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application filed April 29, 1911, Serial No. 624,011. Renewed January 3,1914. Serial No. 810,263.

To aZZ whom it may concern Be it known that 1, JOHN C. SHERMAN, acitizen of the United States, and a resident of Brookline, in the countyof Norfolk and State of Massachusetts, have invented certain new anduseful Improvements in Electric WVeb-Drying Machines, of which thefollowing is a specification.

My invention relates generally to a machine for drying webs of materialsuch as paper, pulp, textiles, etc., and particularly to a machinewherein the drying or heating effect is produced electrically.

As my invention as herein presented is not concerned withany particularembodiment, I have in the drawings provided a diagrammaticrepresentation of the essential features of the invention.

In the manufacture of pulp, paper, textile fabrics and other materialswhich are made in long strips or Webs it is necessary or desirable topass these webs around heated rollers in order to thoroughly dry thematerial. Heretofore these rollers have usually been heated by steam, 'apractice which is open to a number of serious objections.

My electrically operated heating or drying machine is made as follows:To the ends of the primarycore a, made preferably of soft ironlaminations, are secured end frames Z)b having a plurality of arms 1-1,2-2 and 3 -3 the outer ends of which are connected in pairs by secondarycores 0, c and 0 About the primary core (1- there is a primary winding(Z connected with any'suitablc source of alternating current. About thesecondary cores 0, c, c are individual secondary windings in the form ofcopper tubes 0, c, (2 Each of these coils by the nature of itsconstruction constitute closedor short circuited coils.

By properly exciting the primary winding (Z an induced electricalcurrent is set up in the secondary windings c, 0, c and, owing to thefact that each of these second ary windings is short circuited, thiscurrent effect expresses itself in the form of heat. The extent of theheating efi'ect imparted to the secondary windings is determined by thecross sectional area of the secondary core and its length, thesupporting arms 11-1, 2-2 and 3-3 for this purpose being considered aspart of the core.

It is customary to use a considerable number of heating or drying drumsin machines of this character and it will be clear that it is possibleto control the heat in each drum by properly proportioning the crosssectional area of the various secondary cores to their length, with theresult that all drums can be maintained at a substantially uniformtemperature, or the temperature can be varled as desired.

As the limits of machine designed would not in all cases permit of thecontrol of the temperature of the drum by varying the cross sectionalarea and length of the cores, I contemplate providing each secondarycore with an auxiliary primary winding indicated at f, f, f controlledby a proper switch so that it can be provided with a current to eitheraugment or oppose the current in the principal primary winding dependingupon whether it flows in the same or in an opposite direction with theresult that the temperature of any given secondary Winding or drum canbe varied at the will of the machine attendant to suit any condition.Preferably the. secondary windings which take the form of tubular drumsare rotatably mounted on the secondary cores.

I do not wish to be understood as limiting myself to any minor detailsof construction which may have been illustrated or herein abovedescribed. The invention, as it is herein broadly and generallydescribed is, I am aware susceptible of embodiment in vari ous forms.

I claim as my invention:

1. In a heating and drying machine a nonrotatable magnetic core, aprimary winding in one part thereof connected with a source ofelectrical energy and a secondary coil in the form of a tubular drumrotatably mounted upon said core.

2. In a heating and drying machine a non-rotatable magnetic core dividedin part into a plurality of branches, a primary coil mounted'on theundivided portion of said core and connected with a source of electricalenergy, and short circuited secondary coils of tubular form mounted uponsaid branches.

3. In a heating and drying machine a non-rotatable magnetic core dividedin part into a plurality of branches, at primary coil mounted on theundivided portion of said core and connected with a source of electricalenergy short oircuited secondary coils of tubular form rotatably mountedon said branches, and auxiliary primary coils on the branches of saidcore.

7 4. In a heating and drylng machine a non-rotatable magnetic coredivided in part into a plurality of branches, a primary coil mounted onthe undivided portion of said core and connected with a source ofelectrical energy, a short circuit-ed winding in the form of a tubulardrum on each of said branches, and means for varying the inductiveefi'ect between said core and szi-id short circuited s'econdarywindings.

| the primary 5. In a heating and drying), machine, a -on rotatablemagnetic core comprsing a olid DIimf-lj section and a plum secondarysections, a primary WiIlQ o i on section, and short circnitcd windings1n the form of tubular drums on each secondary section.

J UHN G. SHERBLLXN.

Witnesses:

PERCY W. FULLER, Tnos. H. SHERMAN.

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